US10359072B2 - Journal bearing and rotary machine - Google Patents

Journal bearing and rotary machine Download PDF

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Publication number
US10359072B2
US10359072B2 US15/528,636 US201515528636A US10359072B2 US 10359072 B2 US10359072 B2 US 10359072B2 US 201515528636 A US201515528636 A US 201515528636A US 10359072 B2 US10359072 B2 US 10359072B2
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United States
Prior art keywords
bearing
lubricating oil
half portion
rotation shaft
journal bearing
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Expired - Fee Related
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US15/528,636
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US20170260874A1 (en
Inventor
Chihiro Yoshimine
Takeshi Sano
Yuki SUMI
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Assigned to MITSUBISHI HITACHI POWER SYSTEMS, LTD. reassignment MITSUBISHI HITACHI POWER SYSTEMS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANO, TAKESHI, SUMI, Yuki, YOSHIMINE, Chihiro
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Publication of US10359072B2 publication Critical patent/US10359072B2/en
Assigned to MITSUBISHI POWER, LTD. reassignment MITSUBISHI POWER, LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
Assigned to MITSUBISHI POWER, LTD. reassignment MITSUBISHI POWER, LTD. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVING PATENT APPLICATION NUMBER 11921683 PREVIOUSLY RECORDED AT REEL: 054975 FRAME: 0438. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/03—Sliding-contact bearings for exclusively rotary movement for radial load only with tiltably-supported segments, e.g. Michell bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • F01D25/166—Sliding contact bearing
    • F01D25/168—Sliding contact bearing for axial load mainly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/18—Lubricating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/18—Lubricating arrangements
    • F01D25/183—Sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/046—Brasses; Bushes; Linings divided or split, e.g. half-bearings or rolled sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/23—Gas turbine engines

Definitions

  • the present invention relates to a journal bearing and a rotary machine.
  • a tilting pad bearing is widely used as a journal bearing for supporting a horizontally extending rotation shaft from below.
  • the tilting pad bearing includes a plurality of pads arranged in a circumferential direction of the rotation shaft and a carrier ring covering the plurality of pads from an outer circumferential side.
  • a certain gap is provided between an outer circumferential surface of the rotation shaft and the pad.
  • journal bearing As a detailed example of such a journal bearing, a known tilting pad journal bearing is described in Japanese Unexamined Patent Application, First Publication No. 2011-179609.
  • the journal bearing includes a plurality of tilting pads, which are arranged in a circumferential direction of a rotation shaft to rotatably support the rotation shaft and a pair of plates, which are provided to face surfaces on both sides in the axial direction of each of the rotation shafts of the tilting pads.
  • journal bearing described in JP 2011-179609 cannot appropriately support the rotation shaft when the operating state of the rotary machine changes.
  • vibration occurs in the rotary machine
  • swinging vibration occurs on the rotation shaft itself, or when an external load is applied to the rotary machine due to the scattering of a turbine blade
  • an upward load may be applied to the rotation shaft in addition to the downward load described above.
  • the upper half portion of the journal bearing does not have sufficient lubrication performance compared to a lower half portion thereof. Accordingly, when the tilting pad located at the upper half portion contacts with the rotation shaft, there is a possibility that damage may occur to both components.
  • the present invention has been made in view of the above-described circumstances and an object of the present invention is to provide a journal bearing capable of exhibiting sufficient lubrication performance with a small amount of lubricating oil and a rotary machine including the same.
  • a journal bearing including: a bearing lower half portion which slidably supports an outer circumferential surface of a rotation shaft rotatable about an axis extending in a horizontal direction from blow; a bearing upper half portion which supports an upper side half portion of the outer circumferential surface of the rotation shaft; and a lubricating oil supply device which supplies lubricating oil between the bearing lower half portion and the bearing upper half portion, and the rotation shaft, wherein the bearing upper half portion includes a bearing body which faces the outer circumferential surface of the upper side half portion of the rotation shaft with a space therebetween, a land portion which protrudes inward in a radial direction from an inner circumferential surface of the bearing body to form a sliding surface with the rotation shaft and extends in a circumferential direction, and a guide portion which guides the lubricating oil to the sliding surface of the land portion.
  • the lubricating oil which is supplied by the lubricating oil supply device, is guided toward the sliding surface of the land portion by the guide portion provided at the bearing upper half portion in accordance with the rotation of the rotation shaft. Accordingly, the lubricating oil can also be widely distributed between the bearing upper half portion and the rotation shaft.
  • the lubricating oil staying at the side of the bearing lower half portion can be supplied toward the bearing upper half portion since the guide portion is provided. Accordingly, the bearing upper half portion can also be lubricated without increasing the lubricating oil supply amount.
  • the guide portion may include an oil collecting wall which is provided on the inner circumferential surface and extends in an approach direction from the inner circumferential surface to the land portion as it goes from a rear side in a rotation direction of the rotation shaft toward a front side in the rotation direction, and an inclined portion which is provided on the rear side in the rotation direction of the oil collecting wall and extends obliquely from the inner circumferential surface toward the sliding surface.
  • the lubricating oil which flows along the inner circumferential surface of the bearing body is collected toward the land portion by the oil collecting wall and then is supplied onto the sliding surface of the land portion by the inclined portion. Accordingly, the bearing upper half portion and the rotation shaft are lubricated through the lubricating oil on the sliding surface.
  • the guide portion may be formed of an inflow hole which is formed on an end surface of the land portion at the rear side in the rotation direction and into which the lubricating oil flows, a supply hole which is formed on the sliding surface and supplies the lubricating oil to the sliding surface, and an oil supply pipe which communicates the inflow hole and the supply hole with each other.
  • the lubricating oil which flows from the inflow hole is supplied onto the sliding surface through the oil supply pipe and the supply hole. Accordingly, the bearing upper half portion and the rotation shaft are lubricated through the lubricating oil on the sliding surface.
  • a guide groove may be formed on the sliding surface so as to be recessed outward in a radial direction from the sliding surface and to extend toward a center area in the axial direction from both edges in the axial direction of the sliding surface as it goes toward the front side in the rotation direction.
  • the lubricating oil is guided toward the center area in the axial direction on the sliding surface by the guide groove. Accordingly, a film thickness of an oil film of the lubricating oil formed on the sliding surface can be maintained.
  • the bearing upper half portion may include a plurality of the land portions and a plurality of the guide portions arranged in the circumferential direction.
  • the plurality of land portions and the plurality of guide portions are arranged in the circumferential direction. Accordingly, the bearing upper half portion can be lubricated over a wider range in the circumferential direction.
  • the bearing upper half portion may include a plurality of the land portions arranged at intervals in the axial direction.
  • the plurality of land portions which are arranged at intervals in the axial direction are formed in the bearing upper half portion. Accordingly, the rotation shaft can be more stably supported. In addition, since a load applied to each land portion can be reduced, abrasion of the bearing upper half portion and the bearing lower half portion due to aging can be suppressed.
  • the lubricating oil supply device may include an end supply device which is provided between the bearing upper half portion and the bearing lower half portion in a circumferential direction of the rotation shaft, wherein the end supply device may include a front supply part which blows the lubricating oil toward the front side in the rotation direction and a rear supply part which blows the lubricating oil toward the rear side in the rotation direction.
  • the lubricating oil can be sufficiently supplied to each of the bearing upper half portion and the bearing lower half portion by the front supply part and the rear supply part. Particularly, as compared to a case in which the lubricating oil is supplied only to the inside in the radial direction with respect to the axis, the lubricating oil can be more actively supplied to the bearing upper half portion and the bearing lower half portion.
  • the front supply part may be provided in an area corresponding to the land portion in the axial direction.
  • the lubricating oil can be directly supplied to the land portion. That is, a sufficient amount of the lubricating oil can be widely distributed in the land portion.
  • the rear supply part may be provided in an area corresponding to the bearing lower half portion in the axial direction.
  • the lubricating oil can be directly supplied to the bearing lower half portion. That is, a sufficient amount of the lubricating oil can be widely distributed in the bearing lower half portion.
  • the rear supply part may be provided only in an area corresponding to the land portion in the axial direction.
  • the lubricating oil can also be supplied from the front side in the rotation direction of the land portion. That is, the lubricating oil can be more sufficiently distributed in the land portion.
  • the rotary machine includes the journal bearing according to any one of the first to tenth aspects and the rotation shaft supported by the journal bearing.
  • journal bearing capable of exhibiting sufficient lubrication performance with a small amount of lubricating oil and a rotary machine including the same.
  • FIG. 1 is a schematic diagram showing a rotary machine according to each embodiment of the present invention.
  • FIG. 2 is a diagram showing a journal bearing according to each embodiment of the present invention when viewed from an axial direction.
  • FIG. 3 is a cross-sectional view taken along a line A-A of FIG. 1 .
  • FIG. 4 is an enlarged view showing a land portion and a guide portion of a journal bearing according to a first embodiment of the present invention.
  • FIG. 5 is a diagram showing a modified example of the journal bearing according to the first embodiment of the present invention.
  • FIG. 6 is an enlarged view showing a land portion and a guide portion of a journal bearing according to a second embodiment of the present invention.
  • FIG. 7 is an enlarged view showing a land portion and a guide portion of a journal bearing according to a third embodiment of the present invention.
  • FIG. 8 is a diagram showing a journal bearing according to a fourth embodiment of the present invention when viewed from an axial direction.
  • FIG. 9 is a schematic diagram showing a configuration of an oil supply nozzle according to the fourth embodiment of the present invention.
  • FIG. 10 is a diagram showing a modified example of the oil supply nozzle according to the fourth embodiment of the present invention.
  • journal bearing 10 and a rotary machine 100 according to a first embodiment of the present invention will be described with reference to the drawings.
  • a steam turbine 100 which is a rotary machine 100 includes a rotation shaft 1 which rotates about an axis O extending in the horizontal direction, a plurality of blades 2 which are provided on an outer circumferential surface 1 A of the rotation shaft 1 , a casing 3 which covers the rotation shaft 1 from an outer circumferential side thereof, a plurality of stators 4 which are provided on an inner circumferential surface of the casing 3 and are disposed in a staggered arrangement in a direction of an axis O relative to the blades 2 , and a plurality of bearing portions 5 which support the rotation shaft 1 .
  • the bearing portion 5 is a device which supports both ends of the rotation shaft 1 in the direction of the axis O.
  • the bearing portion 5 of the embodiment includes one thrust bearing 9 and two journal bearings 10 .
  • the thrust bearing 9 is a device which supports the load to the rotation shaft 1 in the direction of the axis O.
  • the journal bearing 10 is a device which supports the rotation shaft 1 from a direction intersecting the axis O.
  • the journal bearing 10 includes a bearing lower half portion 11 which supports the outer circumferential surface 1 A of the rotation shaft 1 from below, a bearing upper half portion 12 which supports an upper side half portion of the outer circumferential surface 1 A of the rotation shaft 1 , a lubricating oil supply device 13 which supplies lubricating oil between the bearing lower half portion 11 and the bearing upper half portion 12 , and the rotation shaft 1 , and a pair of side plates 14 which covers the bearing upper half portion 12 , the bearing lower half portion 11 , and the lubricating oil supply device 13 from both sides in the direction of the axis O.
  • the bearing lower half portion 11 includes a plurality of (two) bearing pads 15 which contact with the outer circumferential surface 1 A of the rotation shaft 1 and a carrier ring lower half portion 16 which supports the bearing pads 15 from an outer circumferential side thereof.
  • the two bearing pads 15 are respectively formed as a front pad 15 A which is located on a front side in the rotation direction R and a rear pad 15 B which is located on a rear side in the rotation direction R.
  • the front pad 15 A and the rear pad 15 B are arranged to be separated from each other in the circumferential direction.
  • the front pad 15 A and the rear pad 15 B are formed to be curved in a circular-arc shape when viewed from the direction of the axis O and are formed in a rectangular shape when viewed from the circumferential direction.
  • the radially inner surfaces of the front pad 15 A and the rear pad 15 B are formed to be curved outward in the radial direction to be formed as pad surfaces 17 thereof.
  • the pad surfaces 17 contact with the outer circumferential surface 1 A of the rotation shaft 1 to support the outer circumferential surface.
  • the front pad 15 A and the rear pad 15 B are supported by a support portion (not shown) on an inner circumferential surface of the carrier ring lower half portion 16 .
  • the support portion supports outer surfaces of the front pad 15 A and the rear pad 15 B in the radial direction while coming into point-contact therewith so that these pads are slightly swingably supported.
  • the journal bearing 10 includes a so-called tilting mechanism. When the rotation shaft 1 is displaced in the radial direction due to a vibration or the like, the front pad 15 A and the rear pad 15 B swing about the direction of the axis O to absorb the displacement.
  • front pad 15 A and the rear pad 15 B of, for example, a metal material such as white metal (W87).
  • the bearing upper half portion 12 includes a bearing body 18 (a carrier ring upper half portion 18 ) which faces the outer circumferential surface 1 A of the rotation shaft 1 with a gap therebetween and a guide metal 20 which is provided on an inner circumferential side of the carrier ring upper half portion 18 .
  • the carrier ring upper half portion 18 is a circular-arc member that has substantially the same dimension as that of the carrier ring lower half portion 16 .
  • the guide metal 20 is fixed to the inside of the carrier ring upper half portion 18 in the radial direction.
  • the guide metal 20 includes a plurality of (two) land portions 21 which are in contact with the rotation shaft 1 and a plurality of (two) guide portions 22 which guide lubricating oil toward the land portion 21 .
  • the land portion 21 extends in the circumferential direction along the inner circumferential surface of the carrier ring lower half portion 16 to form a semi-circular-arc shape when viewed from the direction of the axis O. Further, the guide metal 20 protrudes inward in the radial direction from the inner circumferential surface of the carrier ring upper half portion 18 to have a substantially rectangular cross-section when viewed from the circumferential direction.
  • an inner surface in the radial direction has a radial dimension which substantially corresponds to the outer circumferential surface 1 A of the rotation shaft 1 . Accordingly, the inner surface of the land portion 21 in the radial direction is formed as a sliding surface 21 A which slides on the outer circumferential surface 1 A of the rotation shaft 1 .
  • two land portions 21 as described above are arranged with a gap therebetween in the direction of the axis O. That is, the rotation shaft 1 is supported by the sliding surfaces 21 A of two guide metals 20 .
  • both surfaces of the land portion 21 of the axis O in the direction extend in a direction substantially orthogonal to the sliding surface 21 A to be respectively formed as a land portion inner surface 211 S and a land portion outer surface 212 S.
  • a guide portion 22 which guides lubricating oil is integrally provided at each land portion 21 formed with such a configuration.
  • the guide portion 22 is provided at a rear end of the land portion 21 in the rotation direction R. More specifically, the guide portion 22 includes an oil collecting wall 22 A which is provided between two land portions 21 and an inclined portion 22 B which is provided to be adjacent to the oil collecting wall 22 A as shown in FIG. 4 .
  • the oil collecting wall 22 A is a wall surface which extends obliquely in a direction intersecting the axis O from the land portion inner surface 211 S. More specifically, the oil collecting wall 22 A extends toward the land portion inner surface 211 S from an equidistant line L which equally divides an area between two land portions 21 on the inner circumferential surface of the carrier ring upper half portion 18 in the direction of the axis O. Further, the oil collecting wall 22 A extends obliquely to be adjacent to the land portion inner surface 211 S as it goes from the rear side in the rotation direction R toward the front side in the rotation direction.
  • a rear edge in the rotation direction R is formed as a first edge 23 .
  • a front edge in the rotation direction R is formed as a second edge 24 .
  • the first edge 23 is located on the equidistant line L.
  • the second edge 24 is connected to the land portion inner surface 211 S.
  • a surface facing the front side in the rotation direction R is formed as an oil collecting wall front surface 25 .
  • a surface facing the rear side in the rotation direction R is formed as an oil collecting wall rear surface 26 .
  • the oil collecting wall rear surface 26 is provided with the inclined portion 22 B.
  • the inclined portion 22 B is a surface which extends toward the sliding surface 21 A of the land portion 21 from the outside in the radial direction of the first edge 23 of the oil collecting wall 22 A.
  • the inclined portion 22 B extends obliquely at a certain angle with respect to the axis O when viewed from a direction intersecting the direction of the axis O.
  • the inclined portion 22 B has a substantially triangular shape when viewed from the radial direction with respect to the axis O.
  • each of the guide portions 22 is provided in each of two land portions 21 arranged in the direction of the axis O. More specifically, two guide portions 22 are line symmetrical to each other in the direction of the axis O with reference to the equidistant line L. Further, the first edges 23 of the oil collecting walls 22 A of two guide portions 22 are integrally connected to each other on the equidistant line L to be formed as a ridge line portion 30 . That is, two guide portions 22 extend from the ridge line portion 30 toward two land portion inner surfaces 211 S to form a substantially V-shape when viewed from the circumferential direction.
  • a plurality of (four) lubricating oil supply devices 13 are provided in the journal bearing 10 at intervals in the circumferential direction. More specifically, the lubricating oil supply device 13 includes a first oil supply nozzle 13 A which is provided in the front pad 15 A, a second oil supply nozzle 13 B and a third oil supply nozzle 13 C which are provided in the rear pad 15 B, and a fourth oil supply nozzle 13 D which is provided at the bearing upper half portion 12 .
  • the first oil supply nozzle 13 A is provided at the rear end of the front pad 15 A in the rotation direction R.
  • the second oil supply nozzle 13 B and the third oil supply nozzle 13 C are respectively provided at both ends of the rear pad 15 B in the rotation direction.
  • the fourth oil supply nozzle 13 D is provided in the vicinity of the front end of the bearing upper half portion 12 in the rotation direction R to be separated from the third oil supply nozzle 13 C.
  • the first oil supply nozzle 13 A, the second oil supply nozzle 13 B, and the third oil supply nozzle 13 C all communicate with the outer circumferential surface of the carrier ring lower half portion 16 and the pad surfaces 17 of the front pad 15 A and the rear pad 15 B.
  • the fourth oil supply nozzle 13 D communicates the outer circumferential surface of the carrier ring upper half portion 18 and the inner circumferential surface of the guide metal 20 with each other.
  • Lubricating oil is supplied from the outside to the oil supply nozzle (the lubricating oil supply device 13 ). Accordingly, the lubricating oil is supplied to the outer circumferential surface 1 A of the rotation shaft 1 .
  • journal bearing 10 since the journal bearing 10 supports the rotation shaft 1 extending in the horizontal direction, there is a tendency that lubricating oil stays at the lower side due to gravity.
  • the lubricating oil staying at the lower side flows through an area between the bearing lower half portion 11 (the front pad 15 A, the rear pad 15 B) and the outer circumferential surface 1 A of the rotation shaft toward the same direction as that of the rotation direction R of the rotation shaft 1 in accordance with the rotation of the rotation shaft 1 .
  • the lubricating oil passes through the front end of the bearing lower half portion 11 in the rotation direction R in accordance with the rotation of the rotation shaft 1 and then reaches the rear end of the bearing upper half portion 12 (the guide metal 20 ) in the rotation direction R.
  • the guide portion 22 is provided at the rear end of the guide metal 20 (the land portion 21 ) in the rotation direction R.
  • the lubricating oil which flows from the rear side in the rotation direction R is divided into two streams by the ridge line portion 30 in which the oil collecting walls 22 A of the guide portions 22 are contact with each other.
  • the lubricating oil is guided onto the sliding surface 21 A of the land portion 21 by each inclined portion 22 B provided to be contact with the oil collecting wall 22 A. More specifically, the inclined portion 22 B obliquely connects the ridge line portion 30 and the sliding surface 21 A to each other.
  • the lubricating oil flows through the inclined portion 22 B upward from below in an inclined direction in accordance with the rotation of the rotation shaft 1 and then flows onto the sliding surface 21 A.
  • the lubricating oil which arrives on the sliding surface 21 A flows on the sliding surface 21 A toward the front side in the rotation direction R in accordance with the rotation of the rotation shaft 1 . Accordingly, the lubricating oil can be widely distributed on the sliding surface 21 A in the circumferential direction.
  • the guide portion 22 guides the lubricating oil toward the sliding surface 21 A of the land portion 21 in accordance with the rotation of the rotation shaft 1 . Accordingly, the lubricating oil can also be widely distributed between the bearing upper half portion 12 and the rotation shaft 1 .
  • the bearing upper half portion 12 can be lubricated without increasing the lubricating oil supply amount. In other words, sufficient lubricating performance can be exhibited with a small amount of the lubricating oil.
  • the guide portion 22 of the embodiment can be realized just by processing the guide metal 20 . That is, the bearing upper half portion 12 can be lubricated without additionally providing other devices or members.
  • the bearing upper half portion 12 is provided with the plurality of (two) land portions 21 which are arranged at intervals in the direction of the axis O. Accordingly, since a load applied to each of the land portions 21 can be reduced, the rotation shaft 1 can be stably supported and the abrasion of the bearing upper half portion 12 (the guide metal 20 ) and the bearing lower half portion 11 (the bearing pad 15 ) due to aging can be suppressed.
  • the guide portion 22 is provided at the rear end of the guide metal 20 in the rotation direction R.
  • the position at which the guide portion 22 is provided or the number thereof is not limited thereto.
  • a plurality of guide portions 22 may be provided at intervals in the circumferential direction of the guide metal 20 .
  • a guide portion 221 includes an inflow hole 41 into which lubricating oil flows, a supply hole 42 which supplies lubricating oil, and an oil supply pipe 43 which communicates the inflow hole 41 and the supply hole 42 with each other.
  • a rear end of each land portion 21 in the rotation direction R is provided with a plate-shaped connection portion 44 which extends from a pair of land portion inner surfaces 211 S to an equidistant line L.
  • the connection portions 44 are connected on the equidistant line L. Further, a dimension of the connection portion 44 in the radial direction is set to be substantially the same as a dimension of the land portion 21 in the radial direction.
  • connection portion 44 in the rotation direction R A rear end surface of the connection portion 44 in the rotation direction R is formed as a connection portion end surface 44 A.
  • the inflow hole 41 which opens toward the rear side in the rotation direction R is formed on the connection portion end surface 44 A.
  • the supply hole 42 which opens toward the inside in the radial direction is formed on a sliding surface 21 A of the land portion 21 .
  • the inflow hole 41 and the supply hole 42 communicate with each other by the oil supply pipe 43 .
  • the oil supply pipe 43 is formed as a circular pipe in a cross-sectional view to have the same inner diameter dimension from the inflow hole 41 to the supply hole 42 .
  • the lubricating oil which flows through the inflow hole 41 from the rear side in the rotation direction R is supplied onto the sliding surface 21 A passing through the oil supply pipe 43 and the supply hole 42 . Accordingly, the bearing upper half portion 12 and the rotation shaft 1 can be lubricated through the lubricating oil on the sliding surface 21 A similarly to the first embodiment.
  • the oil supply pipe 43 has a circular cross-section and the inner diameter dimension thereof is assumed to be uniform over the entire oil supply pipe 43 in the extension direction.
  • the form of the oil supply pipe 43 is not limited thereto.
  • the oil supply pipe may be formed so that the inner diameter dimension gradually decreases from the inflow hole 41 toward the supply hole 42 . According to such a configuration, as a pressure applied to the lubricating oil increases from the inflow hole 41 toward the supply hole 42 , the flow rate of the lubricating oil reaching the supply hole 42 can be increased. As the flow rate increases, the lubricating oil can reach a further wider area in the circumferential direction of the land portion 21 .
  • a journal bearing 102 of the embodiment includes a plurality of guide grooves 45 formed at intervals in the circumferential direction on a sliding surface 21 A of a land portion 21 in addition to the guide portion 22 described in the first embodiment.
  • the guide groove 45 includes a pair of grooves 45 A which extend from both edges of the land portion 21 in the direction of the axis O to gradually approach a center of the land portion 21 in the direction of the axis O.
  • Each groove 45 A extends to be inclined toward a center from en edge of the land portion 21 in the direction of the axis O as it goes from the rear side toward the front side in the rotation direction R.
  • the pair of grooves 45 A form a substantially V-shape when viewed from the radial direction with respect to the axis O.
  • a sufficient dimensional allowance is formed between a bottom portion (an outer surface in a radial direction) of the groove 45 A and an outer surface of the land portion 21 in a radial direction.
  • the groove 45 A is recessed so as not to penetrate the land portion 21 in the radial direction.
  • the lubricating oil supplied onto the sliding surface 21 A is guided toward a center area on the sliding surface 21 A in the direction of the axis O by the guide groove 45 . Accordingly, a film thickness of an oil film of the lubricating oil formed on the sliding surface 21 A can be maintained.
  • the guide groove 45 includes the pair of independent grooves 45 A has been described in the above-described embodiment.
  • the form of the guide groove 45 is not limited thereto.
  • the pair of grooves 45 A may be connected to each other at the front end in the rotation direction R and thereby to be form as one continuous groove.
  • each groove 45 A may be formed so that a dimension in the direction of the axis O gradually changes from the rear side toward the front side in the rotation direction R.
  • a dimension (a depth) of the guide groove 45 in the radial direction may be set to gradually decrease from the rear side toward the front side in the rotation direction R.
  • guide groove 45 can also be applied to the journal bearing 101 of the second embodiment.
  • FIGS. 8 to 10 a fourth embodiment of the present invention will be described with reference to FIGS. 8 to 10 . Further, the same reference numerals will be given to the components which are the same as those of the above-described embodiments and a detailed description thereof will be omitted.
  • a lubricating oil supply device 13 further includes a fifth oil supply nozzle 13 E (an end supply device) in addition to four oil supply nozzles (a first oil supply nozzle 13 A, a second oil supply nozzle 13 B, a third oil supply nozzle 13 C, and a fourth oil supply nozzle 13 D).
  • the fifth oil supply nozzle 13 E is provided between a bearing lower half portion 11 and a bearing upper half portion 12 in the circumferential direction. More specifically, the fifth oil supply nozzle 13 E is provided at a front end of a front pad 15 A in the rotation direction R. The fifth oil supply nozzle 13 E also blows lubricating oil supplied from the outside toward the rotation shaft 1 similar to the other oil supply nozzles.
  • the fifth oil supply nozzle 13 E includes an introduction portion 131 E which is formed at a substantial center in the direction of the axis O and a pair of bar-shaped injection portions 132 E which extends from the introduction portion 131 E toward both sides in the direction of the axis O.
  • the introduction portion 131 E is connected to a lubricating oil supply source (not shown) including a tank or a pump provided to the outside.
  • the lubricating oil flowing through the introduction portion 131 E is divided into both sides in the direction of the axis O within the introduction portion 131 E and is guided into the pair of injection portions 132 E.
  • the front supply part 133 F is provided only at a position separated from the introduction portion 131 E in the direction of the axis O. More specifically, the front supply part 133 F is provided in an area corresponding to the land portion 21 in the direction of the axis O.
  • the front supply part 133 F is provided at the same position as that of the land portion 21 in the direction of the axis O. That is, the front supply part 133 F can directly blow out the lubricating oil only to the land portion 21 among the pair of land portions 21 and 21 and the inclined portion 22 B surrounded by the land portions 21 and 21 from both sides thereof in the direction of the axis O.
  • the injection holes 133 E which open to the rear side in the rotation direction R are formed as a rear supply part 133 G.
  • the rear supply part 133 G is formed over the entire injection portion 132 E in the direction of the axis O.
  • the rear supply part 133 G is provided in an area corresponding to the bearing lower half portion 11 (the front pad 15 A) in the direction of the axis O. Accordingly, the rear supply part 133 G can blow the lubricating oil toward the front pad 15 A located on the rear side in the rotation direction R when viewed from the fifth oil supply nozzle 13 E.
  • the lubricating oil can be sufficiently supplied to the bearing upper half portion 12 and the bearing lower half portion 11 by the front supply part 133 F and the rear supply part 133 G.
  • the lubricating oil can be more actively supplied to the bearing upper half portion 12 and the bearing lower half portion 11 .
  • the lubricating oil can be directly supplied to the land portion 21 . That is, a sufficient amount of the lubricating oil can be widely distributed in the land portion 21 .
  • the rear supply part 133 G is provided in an area corresponding to the bearing lower half portion 11 in the direction of the axis O, the lubricating oil can be directly supplied to the bearing lower half portion 11 . That is, a sufficient amount of the lubricating oil can be widely distributed in the bearing lower half portion 11 .
  • the rear supply part 133 G is formed in the entire injection portion 132 E in the direction of the axis O.
  • the form of the rear supply part 133 G is not limited to the above-described example.
  • the rear supply part may be provided in an area corresponding to the land portion 21 in the direction of the axis O as shown in FIG. 10 . That is, in this case, the rear supply part 133 G can blow the lubricating oil toward the front pad 15 A located on the rear side in the rotation direction R when viewed from the fifth oil supply nozzle 13 E.
  • the lubricating oil can also be supplied from the front side of the land portion 21 in the rotation direction R thereto. That is, the lubricating oil can be distributed more sufficiently in the land portion 21 .
  • journal bearing capable of exhibiting sufficient lubrication performance with a small amount of lubricating oil. Further, it is possible to provide a rotary machine which can be operated stably by supporting a rotation shaft using such a journal bearing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sliding-Contact Bearings (AREA)
  • Rolling Contact Bearings (AREA)
US15/528,636 2014-11-28 2015-11-27 Journal bearing and rotary machine Expired - Fee Related US10359072B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014-241173 2014-11-28
JP2014241173 2014-11-28
PCT/JP2015/083399 WO2016084937A1 (ja) 2014-11-28 2015-11-27 ジャーナル軸受、回転機械

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US20170260874A1 US20170260874A1 (en) 2017-09-14
US10359072B2 true US10359072B2 (en) 2019-07-23

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JP (1) JP6312346B2 (ko)
KR (1) KR101901081B1 (ko)
CN (1) CN107002750B (ko)
DE (1) DE112015005337T5 (ko)
WO (1) WO2016084937A1 (ko)

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JP6849310B2 (ja) * 2016-02-29 2021-03-24 三菱パワー株式会社 ジャーナル軸受および回転機械
JP7000010B2 (ja) * 2016-02-29 2022-01-19 三菱パワー株式会社 ジャーナル軸受および回転機械
JP6920026B2 (ja) 2016-02-29 2021-08-18 三菱パワー株式会社 ジャーナル軸受および回転機械
KR102115856B1 (ko) * 2016-08-10 2020-05-27 미츠비시 히타치 파워 시스템즈 가부시키가이샤 저널 베어링 및 회전 기계
WO2018029837A1 (ja) * 2016-08-10 2018-02-15 三菱日立パワーシステムズ株式会社 ジャーナル軸受及び回転機械
US11340365B2 (en) 2016-11-17 2022-05-24 Halliburton Energy Services, Inc. Switchable distributed acoustic sensing system for wellbore environment
JP7231437B2 (ja) * 2019-02-20 2023-03-01 三菱重工業株式会社 油浴型軸受装置及び回転機械
CN110332225B (zh) * 2019-06-28 2020-06-23 湖南行必达网联科技有限公司 轴承及轴承组件
CN114285233B (zh) * 2021-11-18 2023-01-13 中国长江动力集团有限公司 一种立轴悬式水轮发电机安装平台
KR102539698B1 (ko) * 2022-11-23 2023-06-07 동양메탈공업 주식회사 직접윤활식 틸팅 패드 저널베어링

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CN107002750B (zh) 2019-06-07
KR101901081B1 (ko) 2018-09-20
WO2016084937A1 (ja) 2016-06-02
US20170260874A1 (en) 2017-09-14
JP6312346B2 (ja) 2018-04-18
JPWO2016084937A1 (ja) 2017-09-07
CN107002750A (zh) 2017-08-01
KR20170073666A (ko) 2017-06-28
DE112015005337T5 (de) 2017-08-17

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